Black Widow

Natasha Romanoff

Played by Scarlett Johansson

Natasha Romanoff was trained from childhood in the Red Room, a covert Soviet program that turned orphaned girls into elite spies and assassins known as Black Widows. She defected to S.H.I.E.L.D., becoming one of its top agents before joining the Avengers, where her combat training, espionage skills, and Widow's Bite stun batons made her indispensable without any superhuman ability of her own. Read more →

First turns up in Iron Man 2.